Adjustable swing saw



@et 25, g.; J, HAJIQEKy 2,134,555

AADJUSTABLE SWING SAW Fi1ed Feb. 19, 1937 2 sheets-sheet 1 1 --f-Zj /8 V 117 s l 34# i L Sb fsf l r f? AV" .MM l /26 l5 765' A [1 1 Mlm-mmm ggg /15 UM. 25, i933., I J, HAJICEK 2,134,555

ADJUSTABLE SWING SAW Filed Feb. 19, 1957 2 sheets-sheet 2 .S UNM,

Patented ct. 245, 1938 UNIYT'EDSTATS PAT-ENT OFFICE'.

2,134,555 ADJUSTABLE sWINGsAW Joseph Hacek,` CicerofIll. Y' ...Application February 19, 11937, serial No. massa z claims. (ci. 14e-46) i yMy invention .relates to a portable machine particularly :adapted for use as a cross-cut swing -saw and-Which is adapted to be set -on Work benches .or other suitable elevated support, vand which vcanbe .easily moved from placefto place `whereverit is desired `to cut pieces vof lumber or other materia'l.- More particularly, the invention `is .directed to a sawing machine made of a relaztively Vsmall number of parts `and which is fadaptedto be packaged andV sold as a knock fdown kit, Vand -to'be .assembled easily by the average `purchaser and user vto be mounted for `either home."oriactoryzuse.A

An `irriportant Vfob-ject .of my invention is the provision I'of a swingable saw having an inexpensive integral `vertical' framefwhich provides for pivotalv mounting of both the motor and a suitable:suspensionbracket upon whichthe pen dulum' typev of saw is easily'mounted.

Affurtherjobject of my invention is the provi- Sion'of an inexpensive integral U-shaped hanger or mounting 'brackeasuspendable and pivotal to a vertical standard forsuspending a pair of spaced apart rods which in turn carry at their lower end suitable journalling means, rotatable shaft and power transmission pulley, each and all of which are relatively easy of manufacture, assembly yor Vdisascmbly and which provides a very. Lefcient and economically operable swing` able cuteoif saw vadapted to out wood pieces or the like moved upon and alongthe supporting base. i

` further object `my invention is the .pro-

vision of aswingable cut-oil saw, having a base, an integral vertical standard with integral arms, pivotal, suspension bracket attached to the' upper ofsaid armsand pivotal on a rotatable shaft wherebyl the f depending bars `or rods may be easilymoved lby the operator, invertical planes, in .combination with adjustable fastening means on one of said rods and engageablewith respect to the loWer of said standard arms to secure said rods and attached parts in any one of a number `of desired positions in the arc of the movement thereof.

A further object of my invention is the 4provilsion .of a relativelyglight, portable metal base `having `means thereon to quickly and easily mount a swing saw supporting standard therein and having a plurality of guide elements thereon. forl guiding the work in oneor `more directions, and having an upwardly opening groove below the .path of .arotatable saw.

Other and furtherobjects of myinvention will .be apparent from the following description and claims. 1

l This invention (in the preferred form) is illustratedand Vdescribed in the following specication vand claims.

As shown on the drawings: Fig. 1 is aside elevational view of the preferred form of my adjustable swing saw.

Fig. 2 is a side elevational view of the same. Fig. 3is a top plan view taken from `above of my adjustable swing saw.

Figg/l is an enlargedffragmentary perspec- .tive view'of the upperarm-and upper end of the standard and with certain parts broken away. Fig. 5 `is `a cross sectional Viewl taken on line 5 -5 of Fig. 1 land looking downwardly.

Fig. 6 is aside elevational view of my invention showing the motor adjustably mounted with respect tothe upper end of the standard and having direct drivingmeans.

Fig. 7 .is a partially cross sectional View of the removably adjustable motor supporting shelf shown` mounted at the top of Fig. 6.

Fig. VSeis a top plan view o-f the upper hanger bracket taken from above and showing the U- y shaped suspension and journalling bracket extended outwardly.

Referring to Figs. 1 to 4 inclusive, reference numeral l!! designates a jbase, Which may be of any suitable material,v ,preferably metal, and which has a plurali-ty of removable aligned lugs Il which serve as guides for shifting Yand moving the work in perpendicular direction tothe saw or other lwork element. Numeral l2`V designates a metal slee ve or bushing formed integral with;

base I D, and which bushing has securely mounted therein `the lower end of a standard or frame i3, preferably madel of metal. The frame-like standard I3 .has` lower horizontally extending integralarm 14, as clearly shown in Fig. 1, and gn roif off-set arm I5, and the apertures of which are ini-alignment -to providefor the convenient insertionland jo-urnalling of rotatable axle shaft I7, theopposite vends of which ypreferably project from .said apertured lugs I6 and Ilia respectively. A suitable vpulley 1.8, preferablyl of the grooved type., is `secured on the left hand endof axle shaft il, as clearly shown in the drawings` I will now describe the suspended swingable frame which is adapted to be either swung by the operator backward and forward, or which may be secured in stationary position by means hereinafter described when it is desired to use the machine as a grinder, sander or the like.

A clevis-like U-shaped angular hanger bracket is' designated by reference numeral I8 and has aligned apertures in its ends through which axle shaft Il is inserted and whereby said hanger bracket E9 is pivotally mounted on said shaft I1,

and to extend horizontally either forwardly or Y rearwardly. Said hanger bracket` has aV pair of spaced apart apertures which form parallel passageways therethrough and in which the upper ends of depending metal suspension rods I8b and Isc are securely mounted, thereby permitting said rods to move as a pendulum and in parallel vertical planes. As shown in Fig. 8, suitable set screws iSd and |90 are threaded through correspondingly threaded apertures in hanger bracket I9 to securely hold the upper ends of said suspension rods I8b and I9a in hanger bracket I9, as clearly shown in Figs. 1 and 4. A pulley 22, preferably of the grooved type, is securely mounted on the axle shaft lI'I and fixed for rotation therewith and in a position between the opposed ends of U-shaped hanger bracket IS. Pulley I8 is secured on one end of said shaft as clearly shown in Figs. 1 and 2.

A U-shaped connecting and journalling bracket 23, which is of a shape and construction substantially identical to hanger bracket I9, and which has a pair of vertical apertures therethrough, is mounted on the lower end of said suspension bars iSb and I9a, said bars I9b and ISa snugly fitting into and extending through said transverse passag-eways to thereby hold said journalling bracket 23 in substantially horizontal position and extended either rearwardly as shown in Figs. 1, 2 and 3 or forwardly as shown in Fig. '7. Suitable set screws 23a and 23h are respectively threaded l through the U-shaped journalling bracket 23 to engage the suspension rods ISU and IBa and to securely hold said journalling bracket 23 in xed position with respect to said rods, as clearly shown in Fig. 8.

The ends of journalling bracket 23 are enlarged to form journalling bosses 24 which have aligned apertures therethrough in which is rotatably journalled a shaft 25 which preferably has on its right hand end'a suitably threaded spindle 25a to provide for convenient mounting thereon of a circular saw 26, or other rotatable working element, either frictional or otherwise, and which is adapted to come in contact with the work or the abject on which the work is to be produced. Said threaded end of said spindle 25a preferably carries suitable shim or lock washer as shown and a threaded locking nut 25h whereby the work element can be quickly mounted or dismounted and changed at will. A pulley 21, of conventional construction and preferably of the grooved type, is secured on rotatable shaft 25 and between the journalling bosses 24, and is in substantially the same vertical plane with the upper pulley 22 on shaft I'I. A exible belt 28 of conventional construction connects and encircles said pulleys 22 and 21 to transmit rotative movement therebetween. For convenience of the operator, a projecting grippable handle 40 threadingly secured with respect to the swingable rods I9a and I9?) and suspended` parts, preferably, to the rod 20, and permits swinging of the suspended frame and attached parts backward and forward.

The motive and driving power for the swing saw of the aforesaid construction my be transmitted to pulley I8 and shaft I1 and to parts driven therefrom from various directions, as for example from an overhead line shaft or from an individual motor placed in any one of a number of convenient positions which may be at any angle and in any relative position with respect to the aforesaid swing saw of my invention as long as it will fulfill the requirement of, and transmit its motive force to, pulley I8 and shaft I'I.

I desire that it be understood that the swing saw substantially as described hereinabove comprises my principal invention, independently of the source of or position of the power driving means, but in the preferred embodiment illustrated in the drawings, to which I do not desire to be limited, I illustrate a typical convenient inexpensive and practical manner of mounting an individual electric motor with respect to the standard I3. That illustrated embodiment comprises ahinge bracket 38 which comprises an apertured portion 30a connected pivotally by suitable hinge knuckles and pintle to horizontally extending shelf-like portion of bracket 3U, as clearly shown in Figs. 1 and 2. The bracket portion 3M is secured by a pair of suitable bolts 38C to an enlarged apertured intermediate part f of the vertical standard I3 whereby the shelf-like portion of bracket 38 will pivot in an upward and downward direction. A conventional electric motor 3| has its legs securely bolted by bolts 32 to said portion of bracket 38, the motor being so positioned that a pulley (shown in dotted lines) may be secured on the projecting ends of armature shaft Sla substantially below and in alignment with pulley I8. A suitable endless belt 34 rotatably connects said motor pulley and upper pulley I8 to rotate the parts as before described. A desirable and novel feature of the aforesaid motor mounting in association with my swing saw is that the weight of the electric' motor will maintain the belt 34 taut and prevent slipping thereof.

An important feature of my invention, in addition to the economy in manufacture and quick and easy assembly and the relatively few number of parts, is the fact that my machine substantially as described provides a pendulum-type pivotal suspended swing saw which the operator can swing forward and backward in a true vertical plane to make an accurate straight-across cut on the board or other object which may be moved horizontally on the work table or Abase I0 either in a direction perpendicular to the circular saw or` otherwise, and either for ripping, diagonal cutting or at whatever angle the operator desires to position the object to be cut, which object may be easily held in desired position with the aid of guide lugs II in base III.

A second alternate adjustable mounting for the electric motor is illustrated in Fig, 6 in which the base or platform forsupporting the motor is composed of a pair of opposed fiat mounting plates 36 and 3l, which are hinged together at one edge as indicated by reference numeral 38. As shown, the lower plate 31 has an integral anchoring hook Blav which is hooked under shaft I'I, as shown in Fig. 7 the pulley 22 being dispensed with in this form. When said hook 31a is anchored as indicated, the plate 3l rests on the flat surface of U-shaped bracket I9. The motorl is secured by suitable bolts to upperY hinged plate 36. The motor pulley is operatively connected by a suitable belt 42 as shown to the machine of my invention heretofore described, namely to the lower pulley 4I on shaft 25. threaded in a correspondingly threaded aperture in lower mounting plate 31 and so that the end thereof will engage the plate 36, and which, when rotated; will either raise or lower the platform 36 to eiect the desired tension in the power transmission belt.

It will be apparent that the vertical supporting standard I3 may be dispensed with in those cases Where equivalent or convenient stationary supporting means are available and the upper arm I5 thereof retained by itself though cut off, as indicated in Fig. 8,.and which arm section may be mounted in stationary position, as for example aV vertical wall or beam to which a hanger bracket arm substantially of the construction shown in Fig. 8, to which it may be secured by suitable screws or bolts. I have illustratedin Fig. 8 the end section of armrIE which actuallyy forms a hanger bracket with its sameV projecting journalling lugs I6 and I6a in which the upper shaft is journalled. It will be obvious that the machine of my invention may be equivalently and satisfactorily swingably mounted over a work bench or the like by means of this at end section of arm I5 and with like result.

Another important and novel feature of my invention is the provision of means for fixing and holding at any one of several desired positions thesuspended work element and depending rods I9a and ISb, in order that the same could be used as a stationary flxedly mounted rotatable saw, and in order that the circular saw could be temporarily xed in any one of several positions and height with respect to the base ID, which is of particular advantage where grooving work or the like is desired to be done and wherein the work would be manually moved toward and under the rotating saw. This novel means comprises an arcuate arm 35'of arcuate shape, shown in Figs. 2 and 3, and which has one apertured end removably mounted about the rod I9a and secured thereon by set screw 35a. A top plan view of a substantial portion of arcuate arm 35 is shown in Fig. 3, and as indicated, one lateral edge thereof has a plurality of spaced apart serrations 35h. As indicated in Fig. 1, the lower integral frame arm I4 has a rectangular aperture I 4a and said `frame arm I4 hasV a threaded vertical aperture therethrough above said aperture Ma in which is threaded a thumb screw Mb, as shown'in Figs. 2

and 3. The thumb screw Mb is so positioned that it Will engage any one of the spaced apart serrations 35h to thereby secure the rods I 9a and I9b and parts suspended thereon at the desired position in their arc of movement, and to thereby permit the positioning of the circular saw with A handscrew 39 is,

respect to the work table and base according to the desire of the operator.

Various changes may be made in the embodiment` of the invention herein specifically described without departing from or sacrificing any of the advantages of the invention or any features thereof, and nothing herein shall bev said frame being pivotally suspended on said shaft; a pair of spaced apart pulleys on said shaft; a rotatable shaft journalled in said lower angular bracket and having a projecting spindle thereon, a pulley on said lower shaft, said spindle being adapted to removably hold a rotatable work element thereon, said suspended frame and attached parts being swingable in a vertical plane; a driving motor; a hinged supporting bracket pivotally mounted on said first mentioned upper horizontal shaft and adjacent the upper end `of said standard for said motor, manually operable screw for adjusting and varying the position of said bracket; a power transmission belt operatively connecting said motor and one of said upper pulleys, andv a belt operatively connecting the other of said upper pulleys and said lower pulley to thereby drive said work element.

porting bracket adapted to be mounted in stationary position; a frame comprising a pair of spaced apart rods and a lower angular connecting bracket; a horizontal shaft rotatably journalled in said upper first mentioned bracket; a pair of spaced apart pulleys on said shaft; a rotatable shaft journalled in said 'lower angular bracket and having a projecting spindle thereon, and a pulley on said lower shaft; said spindle being adapted to removably hold a rotatable work element thereon, said suspended frame'and attached parts being swingable in a vertical plane; a driving motor; an adjustable hinged supporting bracket mounted on said rst mentioned upper horizontal shaft and said upper bracket for said motor; screw means for adjusting said bracket to Vary the distance thereof from said upper rotatable shaft; a power transmission belt operatively connecting said motor and one of said upper pulleys, and a belt operatively connecting the other of said upper pulleys and said lower pulley.

JOSEPH HAJICEK. 

